physics / Light / free
Geometric Optics
Trace rays through mirrors and lenses to predict where images form.
thin-lens image formation1/f = 1/dₒ + 1/dᵢ
The sign convention is compressed into the real/virtual label. The thin-lens model assumes paraxial rays and ignores aberrations.
image distance∞ near focus
magnificationvery large
image typereal
The object is near the focal point, so the thin-lens equation sends the image distance toward infinity. The stage caps the drawing only to keep the geometry on-screen.
04 / PRACTICE
0 / 3 checkedMake the idea yours.
Use the model, then answer without looking back. Each check isolates one decision a learner should be able to make after this lesson.
CHECK 1 / 3